Merge pull request #51 from CenterForDigitalHumanities/ld-update

Update for Linked Data 1.1

Author: sgillies

geojson-context.jsonld

@@ -1,5 +1,6 @@
 {
   "@context": {
+    "@version": 1.1,
     "geojson": "https://purl.org/geojson/vocab#",
     "Feature": "geojson:Feature",
     "FeatureCollection": "geojson:FeatureCollection",

index.md

@@ -7,9 +7,9 @@ title: GeoJSON-LD
 
 **Author**: Sean Gillies (Mapbox)
 
-**Revision**: 1.0
+**Revision**: 1.1
 
-**Date**: 2017-01-03
+**Date**: 2021-12-20
 
 **Abstract**: A vocabulary and JSON-LD context for GeoJSON.
 
@@ -50,6 +50,7 @@ Pasting the following GeoJSON-LD document
 ```json
 {
   "@context": {
+    "@version": 1.1,
     "geojson": "https://purl.org/geojson/vocab#",
     "Feature": "geojson:Feature",
     "FeatureCollection": "geojson:FeatureCollection",
@@ -136,6 +137,9 @@ the following JSON-LD in expanded form.
 ]
 ```
 
+## Note
+JSON-LD 1.0 [cannot process the "list of list" structure](https://www.w3.org/TR/2014/REC-json-ld-20140116/#h_note_8), so many GeoJSON shapes cannot be processed by JSON-LD 1.0 validators. The `"@version": 1.1` property has been added to the GeoJSON-LD context to tell JSON-LD processors to process GeoJSON under the Linked Data 1.1 format, which [can process the "list of list" structure](https://www.w3.org/TR/json-ld11/#example-82-specifying-that-a-collection-is-ordered-in-the-context).  
+
 ## See Also
 
 * [Activity Streams 2.0](https://www.w3.org/TR/activitystreams-core/), from